Millimeter wave refers to electromagnetic waves with frequencies ranging from 30GHz to 300GHz, characterized by extremely short wavelengths (1mm to 10mm). It boasts abundant bandwidth resources, capable of supporting data transmission rates of several Gbps per second or higher. This feature makes it one of the core supporting technologies for 5G to achieve ultra-high speed, low latency, and massive connectivity goals. As a key breakthrough in modern communications, millimeter wave technology profoundly influences the evolution of 5G networks and the popularization of Fixed Wireless Access (FWA) services.

FWA (Fixed Wireless Access) is a technology that provides fixed broadband access services to homes or enterprises via wireless communication networks. Simply put, it replaces traditional optical fibers or cables with wireless means, converting the "last mile" of internet connectivity from "wired" to "wireless" to enable high-speed internet access. In rural or remote areas, where complex geographical conditions, scattered populations, and high fiber optic deployment costs pose challenges, FWA emerges as a cost-effective solution. Leveraging millimeter wave’s high bandwidth, FWA can deliver stable gigabit-level internet speeds, meeting high-bandwidth demands such as HD video streaming, cloud gaming, and remote work, truly realizing "wireless as a substitute for wired."

In practical applications, millimeter wave FWA has been deeply implemented in multiple countries and regions. Domestically, telecom operators have piloted 5G millimeter wave FWA in some rural areas, combining Sub-6GHz networks to balance wide coverage and high speed. These practices not only verify technical feasibility but also demonstrate its enormous potential in narrowing the urban-rural digital divide and promoting rural revitalization. Farmers can engage in live-streaming e-commerce, smart agricultural monitoring, distance education, and telemedicine via high-speed networks, significantly improving production efficiency and quality of life.

However, the most prominent challenge in applying millimeter wave to 5G and FWA lies in its limited propagation characteristics: due to short wavelengths, millimeter wave signals have weak penetration and are easily blocked by buildings, trees, rain, fog, and even human bodies, resulting in limited coverage (typically only a few hundred meters). This necessitates Ultra-Dense Networking (UDN) with a large number of micro base stations, increasing construction and operation costs. Additionally, terminal device power consumption and heat dissipation issues are notable, particularly for outdoor CPEs operating for extended periods, where stability requires further optimization. Furthermore, global standardization of millimeter wave frequency bands is not yet fully unified, with varying spectrum strategies across countries and regions, affecting device universality and large-scale production.

To address these challenges, the industry is optimizing through multiple technical means. Beamforming and Massive MIMO technologies are widely adopted to enhance coverage distance and anti-interference capabilities by focusing signals directionally. Reconfigurable Intelligent Surfaces (RIS), relay technologies, and Multi-Connectivity solutions are also under research to improve signal penetration and network resilience. Meanwhile, chip manufacturers continue to advance the integration and cost reduction of millimeter wave RF frontends, driving CPE devices toward miniaturization and low power consumption.

Looking ahead, millimeter wave technology will continue to play a key role in the evolution of 5G-Advanced (5.5G) and 6G. With the integration of AI algorithms, networks will gain more intelligent beam management and resource scheduling capabilities, further enhancing the practicality and cost-effectiveness of millimeter wave. In FWA scenarios, millimeter wave is expected to deeply integrate with Sub-6GHz, Wi-Fi 6/7, and other technologies, building a multi-layer collaborative wireless access network to achieve seamless coverage and ultimate user experience. It is foreseeable that millimeter wave is not only an "accelerator" for 5G speed enhancement but also a critical engine driving FWA into the mainstream and realizing universal digital inclusion.